Broaching machine



Dec. 17, 1935. M. ROMAINE ET AL BROACHING MACHINE Filed- Aug. 10, 1954 9 Sheets-Shet 1 flu-W;

Dec. 17, 1935. M. ROMAINE ETAL BROACHING MACHINE Filed Aug. 10, 1954 9 Sheets-Sheet 2 M/ MW w Dec. 17, 1935. M. ROMAINE El AL BROACHING MACHINE Filed Aug. 10, 1954 9 Sheets-$heet 3 Filed Aug. 10, 1934 9 Sheets-Sheet 4 m NH Dec. 17, 1935. M. ROMAINE El AL BROACHING MACHINE 9 Sheets- Sheet 6 Filed Aug. 10, 1954 A J M 7 WW wm w v V] 7 a m ww w 1/ $3 3/ w M I w n my. 1 M w Dec. 17, 1935. RoMAlNE ET AL 2,024,253

BROACHING MACHINE Filed Aug. 10, 1954 9 Sheets-Sheet 7 Iz'q: 7%

0% I ff gwwwui Dec. 17, 1935. M, ROMAlNE ET AL v 2,024,253

BROACHING MACHINE Filed Aug. 10, 1954 9 Sheets -Sheet 8 liq 77 -11,1935. M. ROMAINE m1. 2,02 3

BROACHING MACHINE Filed Aug. 10, 1954 9 Sheets-Sheet 9 I 1111111111 IIIIIIIIrrII IIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIII Emu M PatentedDec. 17, 1935 junction with the accompanying drawings form-I Q in Figure l.

Figure 3 is an end elevational view of the ma- "PATENT! orFicE Bnoacnmo MACHINE Millard Romaine, Cincinnati, and Erwin G. Roehm, Norwood, Ohio, assignors to The Cincinnati Milling Machine 00., Cincinnati, Ohio, a co p ration of Ohio A 7 Application August 10, last-scrim No. 139,222

4 aussuto w 20-01mm. (Cl.90-33) invention relates'to improvements in inaparticularly to breaching machine tools and An object of the invention is the provision-of an improved surface broach adapted to operate on relatively large surfaces and produce work pieces in a minimum of time.

Another object of the inventionis the provision of .arbroaching machine of the type above specifled in which a plurality of work supporting tables are e mployed for thereby increasing the output of the machine since the work of one table may. be operated upon while the second table is being d" l v.

Another object oi the invention is the provision or means for varying the length of stroke of the breaching tool, depending upon which table will be next in operative position, thereby cutting down the time that would be consumed byactuating the breaching tools at a slow cutting rate until the work on the next table is engaged.

A further object of the invention is the provision of automatic means for effecting and controlling the movement of the broach ram and the movements of the different tables whereby said movements are fully interlocked and operate in timed sequential order and with a minimum of lost time.

A still further object of the invention is the provision of improved hydraulically actuated and controlled means for effecting the cyclic, automatic operation of the parts as specifledin the foregoing paragraph. a

, Other objects and advantages of thepresent invention should be, readily apparent by reference to the following specification, considered in coning a partchereof and it is to be understood that any modifications 'may be made. in the exact .structural details there shown and described, within the scope of the'appended claims, without exceeding the spirit of the chine as seen substantially from the right hand end of Figures land 2.

Figure 4 'is a transverse sectional view through the machine as seen substantially from line H on Figure 2. Y Figure 5 is a fragmentary rear elevational view locking. mechanism.

shown partly in section and illustrating the table Figure 6 is an enlarged view partly in section and partly in elevation, illustrating the valve operated by the table locking means. 5 Figure 7 is a sectional'view taken substantially onlirie'l-lofFigureL Figure 8 is a fragmentary view as seen from line 8-8 on-Figure 4.

Figure 9 is an elevational view of the left hand end of Figure 8 as seen from line 9-9 thereon.

- Figure 10 is a sectional view illustrating the manually operating lever taken on line III-40 of Figure 1. i I

a Figure 11 is a sectional view through the ram controlled valve as seen from line Il-ll on Figure 4. Figure 12 is a view partly in section and partly .in elevation as seen substantially from line l2-l2 on Figure 4. Figure 13 is a sectional view taken on line I l-ll on Figure 4.

Figure 14 is a sectional view taken on line I 4- of Figure 13.

Figure 15 is a sectional view taken on line lB-ii of Figure-13. a Figure 16 is an enlarged view taken substantially on line I S-l6 on Figure 13.

' Figure 1'7 is a sectional view taken on line I'I-l I on Figure 8. a. j

Figure 18 is a sectional view on line l8-I8 01' Figure 8. 1

Figure 19 is a sectional view through a' pressure actuated valve forming a detail of the invention.

v Figure 20 is a diagrammatical view diagrammatically showing the entire circuit involved in the invention. 1

Figure 21 is a sectional view taken on line 2 l-2l of Figure 12. g Y

Throughout the several viewsoi the drawings 40 similar reference characters are employed to denote the same orfsiinilar parts. As was above noted, this invention pertains to improvements in a breaching machine in whiclr the'work supporting tables are movable to place work \thereon in the line 01' movement of the bro'ach tool. From this it will be noted that-the said parts move in paths at right angles to one another. The said breach and tables are suppoi-ted by a suitable frame-or bed unit which maybe of any suitable or-desirable configuration and either of castings or fabricated.

As shown in the drawings the bed is of fabricated construction, that is, welded of steel sheets and the like. Accordingly, and with reference particularly to Figure 4, the bed comprises a base plate 20 to which is Secured channel irons 2| forming the main support for the superstructure for the broach ram. Welded to the channel irons is the bed plate 22' to which in turn is secured a plurality of ribs 23 forming between them pockets or spaces in which the several control mechanisms, such as valves and thelike, are disposed. On top of the rib plates 23 is a top plate 24 forming a support for the electric motor or prime mover 2%; which effects the rotation of the pumps which circulates the hydraulic medium utilized in the operation of the machine as will later be made clear.

The forward edges of the rib plates 23 have secured thereto a face plate 21, hereshown as of I'-beam construction, with the flanges thereof secured to the upper surface of the bed plate 22 and the under surface of the top plate 24. The face plate 21 in turn has secured to its forward surface spacers 28 to which are secured the ways or guides 29 and 30. The rear edges of the rib plates 23 have welded or secured thereto the rear plate 3|, also supporting some of the controlling mechanisms and bearings for rotating shafts and the like, all of which will be described in detail later.

Secured to the forward supporting channel iron 2| is a plate 32 to whichis welded or otherwise secured a pair of table supporting mecha nisms, each being a duplicate of the other and sincethere is only one of them illustrated in detail it is believed that a description thereof will suffice for both. The table supporting mechanism, therefore, comprises .a base plate 33' the guides 29 and 38. The ram 38 is held against.

said guides 29 and 30 by means ofjgibs 4| and 42 which in effect clamp the guides 39 and 46 between themselves and the guide ways 29 and 36. The ram 38 is provided in its forward face with a plurality of T slots 43 in which. are disposed T bolts 26 for securing the broaching tools 44 thereto. The ram 38 is adapted to be hydraulically actuated for which purpose it has secured, in any desirable manner, to its one end a plate 45, see Figure 3, having an aperture therein through which the free end of a piston rod 46 passes. The other end of the piston rod 46 has secured thereto a piston 41, see Figure 20, which is disposed in a cylinder 48. Opposite ends "of the cylinder are closed by suitable heads 49 and D, the latter including a stufling box which surrounds the piston rod 46 to prevent escape of the hydraulic medium from the cylinder 48. The hydraulic circuit for effecting the operation of the piston is illustrated in Figure 20 and will later be described in detail.

Mounted on each pair of table guides 36 and 31v is a work supporting table 5| and 5|A each having guide ways 52 and 53 which contactwith the guides 36 and 31 and are held against one'another by gibs .54. Each of the tables 5| is provided in its upper surface with'T slots 55 which are adapted to receive T bolts for securing a -81 has secured thereto a piston 88 enclosed withthereto suitable work fixtures and work pieces shown in the drawings in phantom lines and indicated by the reference character 56.

Each of the tables 5| and 5|A is adapted to be actuated by hydraulic means, for which pur- 5 pose they have secured to their forward ends in any desirable manner a. bracket 51 respectively receiving the free ends of piston rods 58 and 59 shown in Figure 20. The inner ends of said rods have respectively secured thereto pistons 66 and 6|, each enclosed in a separate cylinder 62 and 63. Since the physical-structure of each of said piston and cylinder mechanisms and its mounting is the same, but one of them will be described in detail as illustrated in Figure 4. Accordingly, the cylinder 63 is provided at opposite ends with cylinder heads 64 and 65, the latter' of which includes a stuffing box to prevent escape of the hydraulic medium from the cylinder around the piston rod projecting therethrough. 20

The hydraulic circuit for effecting the operation of the pistons 60 and 6|, and therefore the tables 5| and 5|A, is shown in Figure and will be described in detail later.

Passing through each of the 'work tables and bed is a pair of adjusting screws and lock bars 66, 61, 68, and 69; see Figure 5. Each of said bars is provided at opposite ends of its'table with screw threads 18 and 1| on which is respectively provided nuts 12 and 13. In order to vary the position of either table or change the zone through which the table moves, the nuts on each screw at the desired end thereof is backed away or loosened, whereupon the nuts at the other end of the table are moved to effect the movement of the table into engagement with the nuts previously loosened. I

In order to lock the tables at the ends of their movements as effected by the pistons 68 and 6|,

the rear ends of each of the bars 66, 61, 68 and 69 is provided with a pair of wedge-shaped notches 14 and 15 into which wedges 16, 11, 18 and 19 are moved, it being noted that there is an independent wedge for each bar. The wedges 16 and 11 are carried by a carrier 80, while the wedges 5 18 and 19 are secured to a similar carrier 8|. The carriers 88 and 8| are respectively secured to'bars 82 and 83 disposed for axial movement respectively in bearings 84 and 85 carried by the rear end of the bed and the said bars 82 and 83 are connected together for simultaneous movement by a cross head 86. The cross head 86 is secured substantially midway of its length to a piston rod 81. The .upper or free end of the rod in a cylinder 89 between cylinder heads 98 and 9|. The cylinder head 9| includes a stuffing box which surrounds the piston rod 81 and. in addition, provides a bracket whereby the piston and cylinder is secured to the rear plate 3| of the bed. The hydraulic circuit for actuating the I piston 88 is clearly illustrated in Figure 20 and will be described in detail later.

The adjusting screws and lock bars 66, 61, 68 and 69 are each supported at their rear ends by means of half bearings 92, 93, 94 and 95 integral with or secured to individual brackets 96. The brackets 96 are bolted or otherwise secured to the rear angle iron 2| of the base structure and these structures, and therefore the base of the machine, are positioned directly beneath the several locking wedges 16 and 19 inclusive to take v the thrust incident thereto. I

Referring now to Figure 20 the hydraulic circuit will be described and the control valves will be likewise fully described as they are'encountered in the circuit. Disposed within the bed of base of the machine is a tank, indicated in Figure 20 by the numeral 91 which contains the hydraulic medium, preferably oil, to be circulated through the system. Supported by the bedand pulley I03 on a shaft I04. Connected to this shaft I04 are the rotors of the pumps 90, 99 and I00.

The shaft I04 is rotatably journaled in bearings I05 carried by the rear plate 3|.

The pump. 99 is utilized for effecting the cross movement of the work tables and has projecting from one side thereof a suctionpipe I06 which terminates in the sump or tank 91 and has extending from its other side a pressure pipe or conduit I00 through which the medium is discharged by the pump under pressure. Disposed.

within the pressure pipe I08 is a relief valve I09 which determines the ultimate pressure for actuating the work supporting tables. Extending from the main pressure conduit I08 is a branch" conduit I I0, which, together with the conduit I08 terminates in a control valve III. The-valve I II is the main control valve and is adapted to initiate and stop the cycle of the machine, the valve and 17. r

As shown in Figure 4, the valve comprises a housing I I2 secured to one of the rib, plates 23,

preferably near the center of the length of the bed. The valve is adapted to be manually actuated for which purpose it has projecting through the casing I I2 a rod I I3 having integral therewith or secured thereto at theupper end a short rack H4. The rack II4,is slideable through a bracket I I5 and meshes with a pinion H8 enclosed within said bracket "5. The pinion I I0 is keyed or otherwise secured to a shaft II1 jourinaled in the bracket M5 and in a second bracket I I8, see Figure 2. The bracket II8 contains a.

pair of right angle mitre gears 9 which are respectively secured to the shaft I I1 and a-second shaft I20 which terminates in a bracket I2I. Within the bracket I2I the shaft I20 has a rack and pinion connection with a lever I22 exteriorly of the said bracket.

From the foregoing it will be seen that actuation of the lever I22 toward or from the opshifting of the rod II3. As seen in Figural! the mer plunger shifting the latch to a locking position and the latter releasing the latch so that.

the valve mechanism II2 may be actuated. Keyed or otherwise secured to the shaft I28 intermediate" its. ends is a plate I33 having formed therein notches I34, I35 and I38 which cooperate with a pivotally mounted dog I31. A

spring I38 is provided to maintain contact between the dog I3 1 and plate I33, one which also functions to cause the dog I31 and plate I33 to act as'a spring loaded load and. firing mechanism. Near the forward end of the shaft I26, as seen in Figure 17, it has keyed orotherwise secured to, it, a valve shifter finger I39 having its free end disposed within a notch I40 formed in the valve stem I4I of a valve member I42. From the foregoing it will be noted that the oscillation I of the shaft I26 as effected by the lever I22 actuates the valve member I42 of the valve mechanism III to initiate the movement of 011901 the work supporting tables 5|, as will laterbe made clear. .I'hismovement of thetable is arrested by automatically shifting the valve member I42 to its'initialor cut-off position by means a yto be later described.

The valve niechanism III, in addition to ini tiating the movement of the work table, effects the-operation of the table locking pisto'n'and cylinder mechanism 88 and 89. The power'for actuating this wedge lock piston and cylinder mechanism is derived from the pilot pump I00, which asshown in Figure 20 has projecting from one side thereof the suction pipe I43 which termihates in the sump or tank 91. Extending 'The. valve mechanism il l includes the valve member-I42 which isdisposed for sliding movement in the boreof a valve bushing I41 pressed I fntoa bore in the valve casing I12. The bush- .ing I41- has formed t-herethrough a plurality of 'sets'of'radial ports I48, I49, I50, I5I, I52, I53, 7 I54, I55, I58 and I51, each set of ports being conheated together by a similar circumferential groove I58 formed in the exterior of the bushing I41. The valve member I42 is provided with a plurality of collar or piston portions forming between them reduced portions of'cannelures I50, I00, 'I6I, I62 and I63 which connect the sets of I46 terminating in the from the other side of the pump I00 is the pres- 35 being shown structurally in Figures 2, 4, 8,

tu a chamber I06 formed between the inner end of the plug I64 and opposed and or the valve communication ishad.

end is closed by a plug I64 through whichjis formed a port I65 whereby erator, as seen in Figure-.1, will effect a vertical rod H3 within the valve casing. H2 is provided-:- member I42. The position of the valve member" with a notch I23 receiving the ball and I24 of a valve shifter member I 25 keyed or otherwise secured to a shaft I26; oscillatably journaled in bearings provided by the housing H2. The valve shifter I24 has projectingffrom its other side an arm I21, the free or ballendjof which is re.

ceived in a notch I28 of a latchdr locking member I29, whereby the actuationof the .valve mechanism III is normally prohibited. The latch member I29 is pivotally mounted at I30 to a lug integral with the housing II2 free end of the latch I29 is engaged on opposite sides by a spring pressed plunger I3I- and an hydraulically actuated piston plunger I32, the'forand the other or is determined by the notches I34, I35 and I38 formed in the plate I33 above described; From this it will be seen' that the valve member I42 has threeoperative positions, thecentral or neupressure pipe or conduit I 46 from the pump I00.

05 I tral one shown in the drawings and an operative The ports I49, I53 and I51 have respectively connected therewith branch discharge ports or conduits I61, I68 and IE9 which terminate in the sump or tank 91. The ports I54. and I56 have respectively connected therewith one terminus of pipes or conduits I10 and HI, in turn respectively connecting with the left and right hand ends of the wedge cylinder 89. The ports I50 and I52 have respectively connected therewith one terminus of a pipe or conduit I12 and I13, terminating at their other ends in a valve mechanism indicated generally in Figure 20 by the reference numeral I14 and which valve mechanism is operated by the wedge pistons 88 at opposite ends of its movement. The remaining port to the valve bushing I55 formed in the plug I has connected therewith one end of a pipe or conduit I 15 terminating at its other end in a ram operated plunger valve indicated generally in Figure 20 by the reference numeral I16.

With the ports in the positions shown in the drawings and assuming that both work supporting tables 5| and 5IA are in a retracted position with an unfinished work piece mounted on the left hand table 5i A, as seen in Figures 1 and 2, and ready to have a broaching cut performed thereon, the handle I22 is therefore actuated and since this handle is a directional handle for indicating the direction of movement of the tables it will be actuated away from the operator or toward the main bed. The lever I22, as seen in Figure 20, will therefore be actuated in a clockwise direction for shifting the valve member I42 to the left. This movement is permitted because, see Figure 17, the locking arm I21 is disposed in the notch I28 with clearance behind itto permit this movement.

At this time the main pressure conduit I08 is blocked off while the branch pressure conduit I I 0 is connected with the pipe or conduit I13, but flow therethrough is blocked by the valve mechanism I14. Also the pressure pipe I 46 from the pump I00 is connected with the pipe or conduit I to the left hand end of the cylinder 89 as seen in Figure 20, or the lower end of said cylinder as seen in Figure 5. This will cause the piston 88 to be actuated to the right as seen in Figure 20 or upwardly, as seen in Figure 5, and

withdraw the several wedges 16 to 19 inclusive from the outer'wedge notches in which it is assumed they were prior to this time seated.

Near the upper end of the movement of the piston 88 it effects the operation of the valve mechanism I14 through the means disclosed in Figures 5 and 6.

The means for actuating the valve mechanism I 14-, as shown in the two last named figures, comprises a rod I11 depending conveniently from the carrier 8| and in fact may be a continuation of the rod '83 extending through said carrier, the lower end of said rod I11 being threaded to adjustably take lock nuts I18 and I19. Secured to the plate 2| behind the rod I11 is the valve mechanism I14 which comprises a housing I80 containing the said valve mechanism and the means for effecting its operation under the control of the lock nuts I18 and I19.

This valve mechanism I14 comprises a valve bushing I8I pressed into a suitable bore in the housing I80 through which is formed a plurality of ports I82, I83, I84, I85, I85, I81 and I88, each g set of ports being encircled by a similar circumferential groove I89 formed in the exterior of the bushing. Disposed within the bushing is a slidable valve member I90 having formed thereon a plurality of spool or piston portions between which are reduced portions or cannelures I9I, I92 and I93 adapted to connect the ports in different combinations, depending upon the position thereof. 5 The valve member I90 has two positions, that shown in the drawings and a second position to the left thereof. In order to shift the valve to its second position it has connected therewith one end of a valve stem I94 in which is formed a 10 notch I95 receiving the ball end I96 of a lever or arm I91 keyed or otherwise secured to a shaft I98 oscillatably journaled in bearings provided by the'housing I 80. The arm I91 is secured to the shaft I 98 interiorly of the housing I80 and 15 the said shaft projects beyond said housing to receive a second arm I99. The arm I99 has its free or ball end 200 disposed in the path of movement of the upper lock nuts I19 as effected by the movement of the piston 88. Ahead of the arm I99 the shaft I98, as seen in Figure 6, has secured thereto a second arm 20f having one end 202 thereof overlying a spring pressed plunger 203 and having formed on its other end a nose 204. The nose 204 lies adjacent a pivotally mounted latch member 205. The latch 205 has contacting therewith on one side of its pivot a spring. pressed plunger 206 which tends at all times to shift the latch into locking engagement with respect to the nose 204. The latch 205 on the side opposite to that engaged by the plunger 20B is provided with a .cam face 201 cooperating with the lower lock nuts I18 in order to effect a release of the latch member 205.

With the parts in the position shown in Figures 5 5 and 6, and the piston 88 being actuated upwardly as above described the operation is as follows: when the piston 88 reaches the upper or outer limit of its travel the wedges 16 to 10 inclusive are fully retracted, whereupon the tables are unlocked and may be actuated. Just prior to reaching the said upper end of its stroke the lock nuts I19 engage the arm I99 and actuate the shaft 20I in a clockwise direction, thereby correspondingly actuating the valve shifter arm I91v and the plunger arm 20I. Simultaneously, the lower lock nuts I18 free the latch 205 so that it may fall beneath the plunger arm 20I as soon as the valve member I90 is shifted. During this movement ofthe parts the plunger 203 is actuated to load its spring and the said plunger is held under tension by the latch 205. From the foreoing it will now be seen how the valve mechanism I14 is shifted to its second operative position which at this time actually effects the movement of the work table 51A. As seen in Figure 20, the ports I82 and I85 have connected therewith the pipes or conduits I12 and I13 exwnding from the valve mechanism I I I, while the ports I80 have connected therewith one end of a pipe or conduit 208 which extends from the pipe or conduit I1I between the cylinder 89 and valve mechanism III. The ports I83 and I84 have respectively connected therewith one end of a pipe or conduit 209 and 2I0 which terminate at their other ends in a selector valve mechanism indi--' cated generally in Figure 20 by the reference numeral 2H, and it should be noted at this time that the valve mechanism 2II is utilized for determining which of the work supporting tables 5| or 5 IA is to be actuated. The ports I85 have connected therewith one end of a pipe or conduit 2I2 which terminates in the sump or tank 91, while the remaining ports I81 have connected therewith one end of a pipe or conduit 2 I3 which, as shown 'in'Figure 20, terminates at a valve mechanism indicated generally in Figure 20 by the numeral 2 l4 and through a branch conduit 2l5 terminates in .a. valve mechanism indicated generally by the reference numeral 2| 6. The valve mechanisms 2 l4 and 2| 6 are operated respectively by the tables .51 and 5| A at each end of the table stroke;

Upon the shifting of the valve member I90 of the valve mechanism I14 to its left hand or sec- 1;ond operative position thepipe or conduit I13 to which the pressure was connected by the valve mechanism 1 l I is now connected with the pipe 2 In to the selector valve mechanism 2| I. This valve .mechanism 2 H is shown structurally in Figure 19 and will now be'described in detail. Accordingly, and as seen in Figure 19, this valve mechanism comprises a valve casing 2" into which is pressed a valve bushing 2l8 having formed therethrough a plurality of sets of radial ports 219, 226, 221, 222, 223 and 224, each set being encircled by a similar circumferential groove 225 formed in the exterior of the bushing 218. Disposed within the bore in the bushing 218 is a valve member 226 having formed thereon ;a plurality of collars or piston portions forming between them cannelures 221 and 228 for connecting the radial ports with one another in different combinations. The ends of the bore through the bushing 2 l8 are closed by plugs 229 ,and 230, each having formed respectivelytherein a port 231 and 232. The valve member 226 has two operative positions, one as shown in Figure 20 and the other as shown in Figure 19. In order to position the valve member and hold same in either of its two positions one of the collars or piston portions thereof is provided with a pair of [V shapedvnotches 233 and 234 adapted to receive the'pointed or cam end of a spring pressed'plunger 235 carried by the housing 2| 1. a As seen in Figure 20, the ports 226 and 223 of the bushing 218 have respectively connected therewith the pipes or conduits 210 and 269extending lfrom the valve mechanism 114. The ports 219 and 222 have respectively connected therewith one' endof a pipe or conduit2'36 and 231 which respectively terminate at the lower and upper ends of the cylinder 62, as seen in Figure 20, while the ports 22! and224 have respectively connectedtherewith.

I one end of pipes or conduits 238 and 23S terminatingat their other ends inthe lower and upper ends of the cylinder 63, also as seen in Figure 26. The ends for plug ports 231 and 232 have respectively connected therewith one end of pipes 'or conduits .246 and 24! terminating at their other endsinthe dog selecting piston-valve mechanism indicated-in general in Figure 26 by the reference character 242. 4 With the valve member 226 of the valve mechanism" 2H in-the position shown in-Figure 20 the pressure in the pipe'or conduit 2l 0 is connected .into thepipe or conduit 236 for, actuating the piston 86 and shifting the table 51A toward the ram or to the position of table 5| shown in Figure I 4. Themovement' of this table carries with it, of mourse, the adjusting screws and lock bars 68 and 6a, the former of which'carries a dog rail-243A which in longitudinal section issimilar to the dog rail 243 on the bar 66 shown in' Figure 4. The dog rail 243A is therefore provided with a T slot for .adj ustably securing thereto dogs 244A and 245A.

5 \The dogs 244A and 245A are adapted to ultimately reversely oscillate a flipper dog 246 secured to one end of a shaft 241; The shaft 241 is provided by a housing 248 and a sleeve 249, in

. of the valve member turn oscillatably iournaled m a housing 250. As

seen in Figure 8, the housings 248 and 256 are secured to opposite faces of spaced partitions 23, this being due to the fact that the tables, which are necessarily of considerable width, are considerably spaced from one another. "The purpose for the oscillation of the shaft 241 istwo-fold: first, to shift the valve mechanism 216, and second, to return the valve'mechanism I to its central or neutral position. The operation of the valve 10 mechanism 2l6 will first be described, following which the reason and purpose for shifting the valve mechanism lllwill be described.

The valve mechanism 2l6 is shown structurally in Figure 18 and includes the housing 248 5 which in effect is a valve casing having pressed ,thereina valve bushing 25l, having formed therethrough a plurality of sets of radial parts 252,- 253, 254, 255, 256, 251, 258, 259 and 266,

each set of ports'being encircled by a similar 20 other to the right-of the position shown in Figure 20. In order to position the valve member it has projecting therefrom a stem 266 in which is formed a notch 261 receiving the ball end 268 of a shifter arm 269 keyed or otherwise secured -to the oscillatable shaft 241. In order" to accurately position the valve 262, the shaft 241 has keyed or otherwise secured to it a plate 216 in which is formed notches 211 and 212 cooperating with a spring loaded detent arm 213. Additionally, the arms 213 and 216 act as a load and fire mechanism for insuring the shifting 262 beyond the dead center position.

As seen in Figure 20, the ports 255 have connected therewith the terminus of the pipe orconduit2l5 extending from the pipe or conduit 213, while the ports 266, 251 and 252 have respectively connected therewith one end of branch discharge conduits 214, 215 and 216 each emptying into a pipe or conduit 211, in turn connecting with the discharge conduit 212 and the sump or tank 91. The ports 258 have connected therewith one end of a pipe or conduit 218 extending from the pressure conduit I44 from the pump 166. The ports 268 have connected therewith a pipe or conduit 218 which terminates at its other other endin an hydraulic plunger mechanism ends in'the valve mechanism 2, while the remaining ports 253 have connected therewith one end of a pipe or conduit 282 terminating at its 66 263 utilized for shifting the ram pilot valve. It s will be appreciated that the shifting of the valve 7 member 262 by the dog 244a to its second opera-- tive position eflects a different set-up through the valve mechanism 2| 6 and the purposethereof will be described later.

The means for simultaneously shifting the valve member I42 of the valve mechanism I1 I to" its central or neutral position is shown in Figures 8 and 9 and'will now be described in de- 7 tail. its other end is a post 525 having formed at its upper end a pin 526 which passes through a flared aperture 521 formed through a ball 528 disposed centrally of a connecting rod 538. Adapted to cooperate with the ball 528 is an arm 529 integral with and depending from a sleeve 281 pinned or otherwise secured to the shaft I28 which projects beyond the housing or valve casing H2 and on which is fastened the valve shifter arm I39.

The post 525 and the ball 528 are normally, that is, when the machine is not running, in the position shown in Figure 9 with relation to the depending arm 529. When the valve member I42 was initially or manually shifted the arm 529 was actuated in a clockwise direction, thereby bringing the face 533 on the arm 529 adjacent secured thereto an arm 284 from one face of which projects a pin 285. As will later be made clear, the pin 285 is adapted to engage a face 288 formed on an arm 286 integral with and depending from the sleeve 281. The arm 284 is provides. with a cylindrical aperture 53I receiving the ball end 532 of the connecting rod 538 which acts as a guide for said rod upon movement of either the post 525 or the arm 284.

The arm 284 through its pin 285 and the arm 286 are employed to return the valve motor I42 to its neutral position after it has been reversely actuated to return the work table from its operative to its inoperative or loading position, and thereby dispose the parts in their normal relationship above described.

The shifting of the valve member I42 to its neutral position cuts oif the flow from the pipe or conduit I I8 to the pipe or conduit I13 and therefore stops the movement of the table Ia toward the broach ram. At the same time the flow of pressure through the pipe I46 is disconnected from the pipe or conduit I18 and connected with the pipe or conduit I1I for thereby shifting the piston 88 downwardly to cause the locking wedges to enter the grooves in the lock bars and finally position the work supporting table. At the same time that the pressure is introduced into the pipe or conduit I1I it flows into the branch conduit 288 to the valve mechanism I14. It will be remembered that the valve member I98 of this valve mechanism is in its second operative position, that to the left of that shown in Figure 20. At this time then the pipe or conduit 288 is closed and no flow is had therethrough. However, as soon as the piston 88 is in its lowermost position. the lower lock nuts I18 engage the latch cam 281 to permit the spring plunger 283 to shift the valve member to the position shown in Figure 20 and thereby establish a connection between the pipe or conduit 288 and the pipe or conduit 2I3.

Since the table 5IA is now at its innermost position the valve member 262 will be in its second operative position, that is, to the right In addition to the post 525, the shaft 241 has Secured to the oscillatable shaft 241 at of the position shown in Figure 20. This would connect the conduit 2I3 through which pressure is now flowing through the pipe or conduit 2I5 with the pipe or conduit 288 and therefore the valve mechanism 2H3; Since the valve mecha- 5 nism 2I4 is utilized in the continued flow of the medium it will now be described in detail, it being shown structurally in Figure 1'1.

As shown in Figure 17, the valve mechanism 2 I4 includes a housing or casing which is the housing I above referred to through which the oscillatable shaft 241 passes and was given reference numeral 258. The housing 258 has therefore pressed into it a bushing 289 through which is formed a plurality of sets of radial ports 298, 291, 292, 293, 294, 295, 296, and 291, each set being connected by a similar circumferential groove 298, one in the exterior of the bushing 289. Disposed within the bore in the bushing 289 is a valve member 299 having formed thereon a plurality of collars or piston portions between which is formed reduced portions .or cannelures 388, 38I and 382 for connecting the radial ports in different combinations, depending upon the position of the valve 299. By reference to Figure 20 it will be seen that the ports 294 have connected therewith the pipe or conduit 288 while the ports 29I have connected therewith the pipe or conduit 28I also extending from the valve mechanism 2I6. The 30 ports 298 and 291 have connected therewith branch discharge conduits which empty into a conduit 383, in turn emptying into the conduits 211 and 2I2 and the sump or tank 91. The ports 292 have connected therewith the pipe or conduit 2 I 3 which extends from the valve mechanism I 14. The ports 285 have connected therewith one end of a pipe or conduit 384 which terminates at its other end in the pressure conduit I44 from the pump I88. The remaining ports 298 and 293 have respectively connected therewith one end of pipes or conduits 386 and 381 respectively ter-- minating in the dog selector piston-valve mechanism 242 and an hydraulic plunger 388 which operates on the mechanism for shifting the pilot 45 valve, indicated in Figure 28 by the reference numeral 385, aswill later be made clear.

Continuing now with the hydraulic circuit and with the valve member 298 of the valve mechanism 2 I4 in the position shown in Figure 20 the pressure flows through pipe 2I5 to and through pipe 288 where it is connected with the pipe or conduit 381 for actuating the plunger 388. At this time the pressure flowing through the pipe 2I3 is blocked in the pipe 28I by the valve mechanism 2I8. Therefore, through the means now to be described the pilot valve 385 is actuated. This means is illustrated in- Figure 16 and comprises a casing 389 having formed therein a lug- 3I8 containing cylinders 3H and 3I2. Disposed. within the cylinder 3I2 is a. piston 3 I 3 from which the plunger 283 projects, while disposed within the cylinder 3 is a piston 3I4 from which the plunger 388 projects. Ahead of the pistons 313 and 3I4 the cylinders 312 and 3I I are respectively 5 closed by plugs 3I5 and 3I6 through which are formed ports whereby communication is had with the cylinders ahead of the piston. -It is with the port in the plug 3| 5 that the pipe or conduit 282 connects while the port in the plug 3I8 has connected therewith the pipe or conduit 381.

The housing 389 is provided interiorly thereof and in front of the lug 3I8 with a wall or broach 3I1 having formed therethrough suitable apertures through which the plungers 283 and 388 project. Surrounding respectively the plungers 283- and 368 is a spring 3| 8 and 3! respectively abutting on one end with pistons 3l3 and 3l4 and on the other end with the wall or broach 3l1. The springs 3l8 and 3l9 tend to retract their plungers against the force of the hydraulic pressure acting on their pistons, that is, upon release of the pressure on the pistons the plungers are returned to their normal positions by the springs. Secured'to the inner end of the plunger 263 is a cam plate 320, while the plunger 388 has secured to its inner end a similar cam plate 32L The cam plates 320 and'32 l are adapted respectively to engage latches 322 and'323 to render same inoperative. For .this reason the said latches are independentlypivotally mounted within the housing 389 and 'haverespectively connected therewith springs 324 and 325 for normally shifting same to an operative or latching position, whi his that'shown in Figure 16. *The-inner or opposite faces of the latch arms. ''32 and 323- are respectively provided with a shoulder 326 and 321 cooperating with similar shoulders on winged plate 328 keyed or otherwise secured to a shaft 329. As will latenbe described, the shaft 329 has also keyed thereon a valve shifter arm and. a lever whereby under certain conditions the shaft may be manually actuated. The conditions underwhich the shaft 329 may be manually omrated will later be made clear. The plate 328 has itsfwings 330 and 33l disposed respectively'beneath the plungers 283 and 3 88. Y

From the foregoing it will be noted that upon" actuation of either of the pistons 3l3 or 3l4 the plunger connected therewith will be correspondingly moved. The movement of this plunger through its cam plate first renders the latch inoperative, whereupon the released wing of the plate 328 is engaged and actuated by the plunger. This then effects an oscillation of the said plate 328 and the shaft 329. As above described, and with the parts in the position to'which they were shifted. by the movement of the table 388 the" pressure is flowing through the conduit 38 1 act ing on the piston 3I4 and shifting the plunger .308. This renders the latch 323 inoperative and v effects the clockwise oscillation of the plate 328 and shaft 329. I Y

The valve shifter arm isshown in Figure 14 and'indicated by the reference character 332,. and as will there be noted, is disposed ahead of the winged plate 328. The ball end 333 or the lever 332 is disposed in a notch 334 formed in the pilot valve member 335. The pilot valve member 335 has three operative positions, that shown in the drawings and an operative position on either side thereof, thepositions of the valve being. determined by notches 336, 331 and 338 3 formed in the upper surface of the"lever 332' which" cooperates with the nose of a spring .pressed'detent or dog 338.

The valve member 335 is disposed in a valve bushing 340 pressed into a valve casing 3 dis-' posed within the housing 309. The bushing 348 is provided with a plurality of radial ports 342, 343, 344, 345, 346, 341, 348and 349, each'set of ports being encircled by a similar circumferential groove 358. .The valve member 335 is provided with a plurality of collars or piston portions forming therebetween reduced portions or cannelures 35l, 352, 353 and 354 adapted to connect the radial ports in different eombinationa'depending upon the position of the valve member. I By reference to Figure 20 it will be seen that ports 349 and 344 have respectively connected therewith pipes or conduits 355 and 356 whichare connected with and constitute the terminus of the 'main pressure line I44 from the pilot pump I88. The ports 348 have connected there.-

,with one terminus of a pipe or conduit 358 which terminates at its other end in a pipe or conduit 369 between the plunger. valve mechanism I16 and the latch releasing plunger I32. The ports 341 and 346 have respectively connected therewith branch discharge conduits which are inef-' fect extensions of the main discharge conduit 211, terminating at its other end in the sump or tank 91. The ports 345 and 343'have respectively connected therewith one terminus of .a pipe or conduit 360 and 36I terminating at their other ends, as seen in Figure 20, in the left and right hand I ends of a reversing valve for the breach ram and indicated generally in Figure 20 by the reference numeral 362. The remaining ports of the bush 20 ing 2l8 has connected therewith one end of a discharge pipe or conduit 363 which empties into the pipe or conduit 211.

" From the foregoing it will now be seen that the operation of the valve mechanism l I I initiates the movement to one of the work tables which when it reaches its innermost position automatically locks said table in the inner posiitonand then effects the operation of the reversing valve mechanism 362, which initiates the movement of the '30- broach ram. P

During the operation of the pilot ,valve mecha nism 385 the piston valve mechanism 282 was also actuated to position the dogs which automatically stopped the movement of the ramafter it has completed its broaching stroke. As was men-.

.tioned above, the breach ram moves alternately a greater distance to the right and then to the left, depending upon which tableis in operative position and it is for this reason that'the proper 40,

one time and the dogs 366 and368 at theother 50..

time. In addition, to be laterally spaced the 3 dogs 365 and 368 inclusive are, longitudinally spaced relative to the ram, as seen in *Figure" 1. The dogs 365to 368 inclusive are adapted to Theflipper dog 369 has a pair of laterally spaced Wings 318 and 31! connected to one anotherby bridge piece 312. Theram dogs 361 and 368'operate on the wing 3" while the ram dogs 365 and 366 operate on the wing.316.z

The dog mechanism 369 is splined to. a shaft 313 'rotatably mounted in a bracket 314 carried by the main bed and inthe bracket 389. Additionally, the dog mechanism 3691s provided with a slot on receiving a pin 316 carried by a'1ink 311. The link 3-11 is keyed or otherwise secured to a vertical shaft 318 oscillatably mounted in bearings provided by the housing- 369. The oscillata--- ble vertical shaft 318 has keyed to its upper end a lever 319, see Figure 15. The lever 319'has' its ball'end 380, see Figure '13, received in anotch 381 in a slide rod 382 disposed for sliding move ,ment in suitable bearings provided by the housing 309. Projecting from the rod 382 is a lug 383 operate on the flipper dog 369.shown in Figures 55 -12 and 21.

by a similar circumferential groove 392 formed in the exterior of the bushing 386. The piston valve member 385 is provided with a pair of undercut portions or cannelures 393 and 394 adapted to connect the radial ports in the bushing in different combinations, depending upon the position of the piston valve member 385.

This piston valve member 385 has two operative positions, one as shown in Figure 20 and the other as shown in Figure 13. In order to accurately position the valve the shifter arm 319 therefore is provided with a plate extension 395 in which is formed notches 396 and 391 cooperating with the noxe 398 of a lever or detent 399. A spring 460 is provided having one end anchored within the housing 399 and the other end connected with the detent 399 to maintain engagement between the detent nose 399 and the lever plate 395.

The piston valve member 385 is adapted to be shifted by hydraulic pressure to its operative positions for which purpose the bushing 386 is closed at opposite ends by plugs 401 and 402 through which is respectively formed ports 403 and 404 to afford communication to the cylinder bushing at the ends of the piston valve member 385.

By reference to Figure 20 it will be seen that the plug ports 403 and 404 have respectively connected therewith the other ends of the pipes or parts 390 and 388 have respectively connected therewith the other terminus of pipes or conduits 240 and 241 extending from the tables selecting valve mechanism 211. The remaining bushing ports 381 and 368' have connected therewith branch discharge conduits emptying into pipe or conduit 405 connected with the discharge conduit 211 and tank 91.

From the foregoing description it was noted that when the table 51A reached its innermost position it shifted the valve mechanism 216 to its second operative position. The shifting of the valve mechanism 216 connected the pilot pump pressure in pipe or conduit 218 with the pipe or conduit 219 and therefore the left hand end of the piston valve mechanism 242. Under these circumstances the piston valve member 385 is shifted to the position shown in Figure 13, which through the rod 382, lever 319, oscillatable shaft 318, and link 311 shifts the flipper dog mechanism 359 to the position shown in Figure 12 for disposing the-flipper dog wing 311 in position valve member 406 and an unloader valve member 461. These valve members 406 and 401 are enclosed in a single casing or housing 408. The reversing valve member 406 is of the sliding piston type adapted to be shifted by hydraulic pressure and the said member is formed with a plurality of piston or spool portions, forming between them cannelures 499, 410 and 411. The valve member 406 is disposed in the bore in a valve bushing 412 which is pressed into a suitable bore in the housing or casing 468. The bushing 412 has formed therethrough a plurality of sets of radial ports 413, 414, 415, 416, 411 and 418, each set being encircled by a similar circumferential groove 419 formed in the exterior of the bushing 412.

In order to hydraulically shift the valve member 436 the ends of the bore through the bushing which close by similar bonnets 426 and 421, each of which provides a bearing for a sleeve 422 and 423, having on their outer ends flange heads 424 and 425. Disposed within the sleeves 424 and 425 is respectively plungers 426 and 421. The bonnets 420 and 421 are respectively closed at their outer ends by plugs 428 and 429 through which is respectively formed ports 430 and 431.

By reference to Figure 20 it will be seen that the radial ports 413 and 416 have respectively connected therewith one terminus of branch pressure conduits 432 and 433 which terminate at their other ends in a pressure conduit 434 which extends from the ram actuating pump 93. The ports 415 and 411 have respectively connected therewith one terminus of pipes or conduits 435 and 436 which respectively terminate at the left and right hand ends of the broach cylinder 48. The ports 414 have connected therewith one end of a pipe or conduit 431 which is the main discharge conduit for the piston and cylinder mechanism 41-48. The remaining bushing ports 418 have connected therewith one terminus of a pipe or conduit 453 which terminates at its other end in a back pressure valve indicated generally in Figure 20 by the reference numeral 454. The plug ports 430 and 431 are respectively connected with the pipes or conduits 361 and 360 extending from the pilot valve mechanism 304.

As was above noted, the unloader valve member 401 is mounted in the same casing 483 as the reversing valve member 496, which was done primarily for convenience since the said valve members may be incorporated in a single member. The valve member 401 is adapted to be pressure actuated thesame as the valve member 406 and has formed thereon piston portions, forming there between a reduced portion or cannelure 433. In order to pressure shift the valve member 401 it has contacting with the ends thereof piston plungers 439 and 440, each being of a different area in cross section, wherefore equal pressures acting thereon will always shift the valve member to a given position for a purpose. that will later be made clear. The plungers 439 and 440 are respectively slidably mounted in bonnets 441 and 442 secured to the ends of a valve bushing 443 in which the valve member 401 is disposed. The ends of the bonnets 441 and 442 are respectively closed by plugs 444 and 445 through which are respectively formed ports 446 and 441.

The unloader valve bushing 443 has formed therethrough a pair of radial ports 448 and 449, each set being encircled by a similar circumferential groove 450 formed in the exterior of the bushing 443.

By reference to Figure 20 it will be seen that the ports 448 have connected therewith one terby the valve member cannelure 451. the ports 456 are more or less choked off, de-

its other end in the discharge conduit'431. The

ports 449 have connected therewith one end of a. pipe or conduit 452 which terminates at its other end in the cylinder pipe or conduit 435.

The back pressure valve mechanism 454 is utilized during the cutting stroke of the broach ram to maintain a definite back pressure on the ram to cause a smooth cutting stroke or action and to compensate for any tendency of the broach ram to either lag or run ahead. As shown in Figure 20, this back pressure valve comprises a casing 455 in which is disposed a shiftable spool type valve member 456 in which is formed a reduced portion or cannelure 451. The bushing 455 has formed therethrough ports 458 and 459 which are adapted to be connected through the casing In practice,

pending upon the resistance offered by the work to insure the broaching tool traveling at a uniform rate during its cutting stroke as above pointed out. In order to position the valve member 456 the casing 455 is connected at one end through a choke coil 466 and one way check valve 46I with the discharge conduit 453. Addiduit 453 is cut ofi from the pipe or conduit 431 by the valve member 456 but this pressure acting on the piston plunger 465, at the end of the valvemember opposite to that of the spring 463, shiftsthe said valve member against the resistance of the spring 463 for opening the ports 456.to a point depending upon the adjustment of the spring abutment 464 and the normal back pressure. As the back pressure increases, the'higher pressure unseats the one way check valve to per-. mit a flow into the casing against the plunger.

465 for shifting the valve member 456 and further opening the ports 458, thereby effecting a drop in the pressure in the return line. As this pressure drops there is a corresponding drop in pressure on the plunger 465 whereupon the spring 463 expands to return the valve member to its normal position, forcing the plunger to the left and exhausting the medium ahead of it through the choke coil 466 into the conduit 453 and conduits 462 and 431 in the tank 416. 1

The ram pump pressure line 434 has connected therewith one terminus of a pipe or conduit 466 which terminates at its other end in a relief valve mechanism 461. It will be noted that the valve mechanism 461 is very similar'to the back pressure valve mechanism 454 and it is believed that a specific description thereof is not necessary here. The relief valve mechanism is connected -'tions relative thereto.

valve member 411 projects beyond the bushing 4412 1 where it is formed with a conical portion by cutting off the pressure from the pilot pump in'the pipe or conduit I44 from the pipes or conduits 366 and 36I and instead connecting the. full pressure inthe pipe or conduit 366 only.

This pressure, acting on the left hand end of the 5 reversing valve mechanism, shifts same to the right for connecting the pump pressure line 434 through the pipeor conduit 433 with the pipe or conduit 435 and the left hand end of the cylinder 48. The piston 41 is thereby actuated to the right to effect a cutting stroke to the broach relative to the work on the table 5IA. Near the end of the cutting stroke the broach effects the operation of the valve mechanism I16 which is shown in detail in Figure '1 and will now'be fully 15 described. I r I As seen in Figure 7, the valve mechanism I16 comprises a casing 469 from which projects an integral arm 416 through which extends a plate 41I for securing the mechanism in position above 20 the broach ram. Pressed into the casing 469 is a valve bushing 412, having formed therethrough a plurality of sets of radial ports 413, 414,. and 415, each set of ports being encircled by a similar circumferential groove 416 formed in the exterior 25 radial ports when in different operative 'posi- 30 The lower end of the or cam point 419. The upper end of the valve member 411 has abutting it one. end ofa spring 35 486 which abuts on its other end with a cap or plug 48L closing the upper end of the bore in the bushing 412. A spring 486 tends to urge the valve member 411 downwardly, which movement is limited by a pin 482 projecting from 40 the valve member and disposed in an elongated aperture 483 formed in the bushing 412.

The-valve member 411 is moved againstthe resistance of the spring 486 by a cam plate 484 secured to the upper surface of the broach ram. 45

- As was mentionedabove, the valve member 411 'nected therewith one terminus of a pipe or conduit 4.85 which is connected at its other terminus in the discharge pipe or conduit 211. The ports 55 414 have connected therewith the other terminus of the pipe or conduit I15 extending from'the plug port I65 of the valve mechanism III. The remaining ports 413 of the bushing 412 have connected therewith the other terminus of the 60 pipe or conduit 359 extendingfrom the latch releasing plunger I32.

When the broach ram reaches the end of its stroke while operating on a piece of work on work table 5IA the dog 361 thereof acts on the win 316 of the flipper dog' mechanism' 369. This oscillation of the dog mechanism 369 effects the return of the pilot valve member to its neutral position shown in Figure 20 through the follow ing mechanism. The spline shaft 313 has keyed or otherwise secured to it within the housing 369 a rack pinion 486 which meshes with rack' teeth 481 at the lower end of a vertically slideable rack bar 488 carried by the housing 369, see FigureslZ and 15.

tables.

The upper end of the rack bore 488 is provided valve mechanism I14. When the piston 88 with rack teeth 489 meshing with teeth of a pinion 490, keyed or otherwise secured to the shaft 329 to which is secured the valve shifter arm 333 above described. The movement of this shaft by the dogs, as above described, returns the valve pressure acting on the plungers 283 and 308, de-

pending upon in which direction the ram is moving, whether through a cutting stroke or an idle stroke. The manual means just referred to is shown in Figures 1, 2 and 13 and comprises a second rack pinion 49I secured to the shaft 329. Therack pinion 49I' meshes with suitable rack teeth formed on rack bar 492 intermediate its ends, the said rack bar being mounted for sliding movement in bearings provided by the housing 309 and additional brackets or housings 493 and 494. As seen in Figure .2, the housings 493 and .494 are respectively disposed on the left hand side of the table 5IA and the right hand side of table 5|, whereby the operator may control the pilot valve to stop the movement of the ram from the two remote positions relative to the work tables. The housings 493 and 494 include suitable mechanism, such as racks and pinions, for

sliding the rod 492 and the said rack and pinion mechanisms have projecting respectively therefrom shafts 495 and 496 to the outer ends of which are respectively secured handles 491 and The return of the pilot valve member to the neutral position effects the sequential operation of several units, as will ,now'be described. The shifting of the pilot valve member connects the pilot pump through its pressure line I44 and conduit 356 with the reversing valve mechanism lines I 360 and 36I, thereby directing equal pressures against the ends thereof. This effects the cenl tralization of the reversing valve member and a stopping of the broach ram in a cutting direction. At the same time the pilot valve member connectsthe pilot pump through the pipe or conduit I44 and pipe or conduit 355 with the pipe or conduits 358 and 359. This first actuates the piston plunger I32 to render the latch I29 inoperative so that the shaft I26, and therefore valve member I42 of control valve mechanism III, may be reversely actuated. Since, prior to the operation of the pilot valve member by the ram dog 381, the cam plate 488 engaged the plunger valve member 411 for cutting the pipes or conduits 359 and I15. Therefore, as soon as the latch member I29 was rendered inoperative the valve member I42 was shifted to its reverse position from that effected by the handle I22. This position of the valve member I42 is to the right of that shown in FigureZO; which connects the pilot pump through the pipes or conduit I44 and I46 with the pipe or conduit I10 and the left hand end of the wedge lock cylinder 89 for shifting the piston 88 to the right and thereby releasing the At the same time the cross or table actuating pump 99 is connected through the pipe or reaches its unloading position it, through the mechanism described above, at the beginning of the movement of the table 51 again shifts the valve member I to its left hand position as seen 5 in Figure 20, thereby connecting the pressure in pipe or conduit I12 with the pipe or conduit 209. The pipe or conduit 209 is connected through the tables selecting valve mechanism 2 with the pipe or conduit 231 and the upper end of the table cylinder 62 for effecting the retraction of the table 5IA and its now' completed work piece. The table 5IA continues to retract until its dog 244A engages the flipper dog 256 and through the shaft 241, and parts carried. thereby, shifts 15 the valve mechanism III to its neutral position, that shown in Figure 20, and the valve mechanism 2I6 to the position also shown in Figure 20. The shifting of the valve mechanism 2I6 to the position shown in Figure 20 and with the 20 valve mechanism 242 to its right hand side as above described, the following flow of hydraulic pressure takes place. From the pilot pump I00 through the pipes or conduits I44 and I46 control valve mechanism III, pipes or conduits HI and 25 208, valve mechanism I14, pipe or conduit 2I3, valve mechanism 2I4, pipe or conduit 28I, valve mechanism 2I6 and pipeor conduit 282 to the piston plunger 283 for operating the pilot valve actuating mechanism and shifting the pilot valve 30 member to the right as seen in Figure 20. The shifting of the pilot valve to its right hand position connects the pilot pump through the pipe or conduit 38I with the reversing valve mechanism 362, thereby connecting the ram and pump with 35 the right hand end of the piston 48. The pressure in the pilot pipe or conduit 36I also shifts the unloader valve member to connect the exhaust or left hand end of the cylinder 48 with the pipe 45I, as well as the pipe 431, thereby pro- 40 viding an unrestricted outlet for the fluid being discharged from the cylinder 48.

The hydraulic medium circulated by the pilot pump on flowing through the pipe 282 to the piston plunger 283 also flows through the pipe or 45 conduit 351 to the dog valve mechanism 242 where it is now connected through this valve mechanism 242 with the pipe or conduit 240 and the left hand end tables selecting valve mechanism 2 for shifting saidmechanism to its right hand posi- 50 tion.

The return or retracting movement of the ram and broach to the right continues until the ram pilot valve member, as seen in Figure 20, con- 05 nects the pilot pump with both pilot pipes or con- I duits 380 and 36I to the ram reversing valve mechanism 362 for shifting the said valve mechanism to its neutral or central position and thereby stopping the movement of the broach ram. 70 At this time both work supporting tables are in their outer position, table 5 IA having mounted thereon a finished work piece while the table 5I has secured thereto an unfinished work piece which was done during the broaching or tooling 74 mechanism 2 I I.

'end of which the arm 286 depends.

of the work piece on table 5 IA as above described. Thev cycle of the machine is then repeated by actuating the handle I22; this time, however, actuating the work table 5| toward the broach ram instead of the .table 5IA.

The handle I22 is therefore engaged to actuate the valve member I42 of the main control-valve mechanism III to the. left as seen in Figure 20, whereupon substantially the same operation en-. sues, as wasabove described, when this valve is shifted. It will therefore be appreciated that the tables actuating pump 99 through the pipe or conduit H is connected with the valve mechanism I14, while the pilot pump I00 is connected through the pipe or conduit I46, valve mechanism III and pipe or conduit I10 with the cylinder 89 for releasing the tables. As soon as the tables are fully. released the valve mechanism I14 is actuated for connecting the medium from the tables pump 99 with the tables selector valve Since this valve is now in its right hand position the pressure thereto will be connected with the cylinder 63for actuating the piston BI and table toward the broach ram.

This movement of the table continues until it reaches the position shown in Figure 4, at which time the dog 245 on the dog bar 243, carried by the adjusting screw and lock bar 61, operates to shift the valve mechanism 2I4 to its second or right hand position as seen in Figure 20. The means for slnfting this valve mechanism comprisesa flipper dog 499, see Figures 4, 8 and 9, from opposite sides of which project wings 500 and 50I. The flipper dog 499 is loosely mounted on the shaft 241 carried by the housings 248 and 250 and the said flipper dog has projecting therefrom the sleeve 249 in which the shaft 241 is journaled. Interiorly of the housing 250 the sleeve 249 has secured thereto a valve shifter lever 502 which has its ball end 503 disposed ina slot 504 7 formed in the valve stem of the valve member 299 of the valve mechanism 2I-4. This valve member 299 has two operative positions as above described which are determined by-a spring loaded detent 505 pivotally mounted within the housing 250 and having its nose 506 cooperating with notches 501 and 508 formed in a plate.509 secured j to the sleeve 249.

, From the foregoing it will be seen that soon I as the table 5I reaches the broaching position it operates its valve for stopping further movement thereof in the same mannerthat the table 5lA cperated its valve mechanism.

Similar to the operation which took place when the work table 5IA reached its broaching position, the broach table 5i shifts the valve mechanism III to a neutral position through mechanism similar to that employed for shifting the said valve mechanism through the work table 5IA. This means is shown in Figures 8 and 9 and comprises a second arm 5I0 which is similar in all'respects to the arm 286 but depends from. the rear end of the sleeve 281, from the forward v This arm 5I0 is provided with a face 5 adapted to be engaged bya pin 5l2 projecting from the side 'of a plate 5I3 which is integral with and upstanding from the flipper dog mechanism 499. From this it will. be seen that the flipper dog mechanism, upon being actuated to shift the table valve mechanism 2I4 to its second or stop position, also shifts the control valve mechanism I I I to its neutral position.

next to be operated upon.

with the wedge locking piston and cylinder mechanism 88-.89 for locking the tables in their present positions, that is, with the table. 5| adjacent the broach ram and the table 5IA in a retracted position. As soon as the locking is complete the 5 valve mechanism I14 is'shiftedto connect the hydraulic pressure to the plunger mechanism 308 and effect the movement of the broach ram through its stroke. Simultaneously, the pressure from the pilot pump I 00 is connected through the pipes or conduits I44 and 304, valve mechanism 2I4 and pipe or conduit 306 for shifting the dogs piston-valve mechanism 242 to the position shown in Figure 20. This, of course, sets the flipper idogmechanism 362 for stopping the 15 broach ram when it reaches the end of its cutting stroke. At the same time the piston valve mechanism 242 is connected up with the tables selector valve for eifectingits operationas soon as the broach stroke reaches its return position as fully described in connection with-the cycle of operation pertaining to the work table 5IA.

The same connection and cycle of operation is employed for translating the broach ram to the right as seen in Figures 1 and 20 as was described above. This movement of the broach ram'is at this time stopped by the ram dog 368, thereby permitting the ram to travel itsfull stroke in a .cutting direction since it is at this time operating III is released for power shifting to its right hand position, as seen in Figure 20, whereupon the work table 5| and its finished work piece are shifted outwardly to the unloading and loading position which when it reaches its position shifts the valvemechanism 2 I4 to the position shown in 40 Figure20. This, of course, shifts the pilot valve mechanism to a position to effect the return of the broach ram and a setting of the tables selector valve mechanism 2 so that table 5Ia will next be actuated to the broaching position. The broach ram returns to the left through its a idle stroke until the dog 366 thereon engages with the flipperdog ear 3" for then stopping the broach ram in its idle initial position. It will be appreciated that at this time the broach ram is actuated through its maximum return or idle stroke since the nearer or first table 5Ia is From the foregoing it is believed the full operation of the machine will be apparent without a specific description of this operation since the foregoing described the parts while efiecting a full cycle of the machine. However, the cycle may be briefly de2cribed as follows:

With the parts as shown in Figures 1 and 2, the handle 522 is actuated to initiate the operation of the machine. This causes the work table 5| to advance from the receded position to the operative position, which when reaching said position initiates the movement of thetool slide for effecting a stock removal from the work. As soon as the slide reaches apoint just beyond the said table 5| it automatically retracts the said table whereupon the tool slide is automatically started through its idle or return stroke.- The tool slide return movement is stopped as soon as the second table 5Ia is clear and without continuing to its initial inoperative position.

During the operation on the work on the table 5| the table 5Ia was being loaded. Therefore, 

